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These were separate initially because they depended on content. Since
that's not the case any more, it makes sense to merge these into the
main gpu_unittests.

R=piman,kbr
BUG=NONE

Cq-Include-Trybots: luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
Change-Id: Ic9a4894f7e2287055571e60597442f585fa3cbb3
Reviewed-on: https://chromium-review.googlesource.com/976983Reviewed-by: Kenneth Russell <kbr@chromium.org>
Reviewed-by: John Budorick <jbudorick@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Reviewed-by: Antoine Labour <piman@chromium.org>
Commit-Queue: Sunny Sachanandani <sunnyps@chromium.org>
Cr-Commit-Position: refs/heads/master@{#545982}